Clamp for shoe-jacks.



No. 687,362. Patented Nov. 26, 190i.

E. E. WINKLEY.

CLAMP FOR SHOE JACKS.

(Application filed Nov. 16, 1899.) (No Model.) 2 Sheets-Sheet I.

[AM/M 4 No. 687,362. P a tgnt ed N ov. 26, I901.

E. E. WINKLEY.

CLAMP FOR SHOE JACKS.

( Application filed Nov. 16, 1899.)

(No Model.) 2 Sheets-Sheet 2.

WM/45 WZM PAET ERASTUS E. WINKLEY, OF LYNN, MASSACHUSETTS.

CLAMP FOR SHOE-JACKS.

SPECIFICATION forming part of Letters Patent No. 687,362, dated November 26, 1901. Application filed November 16, 1899. Serial No. 737,147. (No model.)

T0 00% whom it may concern:

Be it known that I, ERASTUS EWINKLEY, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Clamps for Shoe- Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to jacks for shoe machinery, and more particularly to lastclamping and centering devices for jacks for positioning and holding the last and shoe firmly fixed while various operations are being carried out on the shoe.

The object of the present invention is to pro duce last centering and clamping devices for shoe-jacks which shall firmly clamp the last on opposite sides thereof and which may be readily adjusted for lasts of varying sizes.

To the above end the present invention consists of the devices and combinations of devices whieh will be hereinafter described and claimed.

The present invention is illustrated in the accompanying sheet of drawings, in which Figure 1 shows a rear elevation of a jack embodying the invention, the base-plate being shownin section. Fig.2showsasideelevation of the upper end of one of the last-centering clamps. Fig. 3 is a View in side elevation of the lower rear portion of the jack, and Fig. 4: is a sectional View on the line 4 4 of Fig. 3.

Ihaveillustrated the inventionas embodied in a jack such as shown in my pending application for a heel-nailing machine, filed August 12,1899, Serial No. 726,999, and while it is particularly adapted for centering and clamping the last and shoe in such machines it is by no means limited thereto.

In the drawings, 1 indicates the base-plate of a jack, and 2 the heel post or standard, upon the upper end of which is supported the last and shoe 3, as clearly shown. Secured to shafts 4, journaled in the base 1, are the levers 5, disposed upon opposite sides of the heel-standard 2, and pivotally mounted at 6 to the levers 5 are the levers 7, which carry at their upper ends the last centering and clamping devices.

The foregoing mechanism, with the exception of the centering and clamping devices, may be and preferably is the same as the corresponding mechanism in the machine of the application hereinbefore referred to, it being understood that the levers 5 are rocked by suitable mechanism toward and from the last to cause the clamping devices to be engaged and disengaged therefrom. In the present invention the clamping devices are arranged to engage the last near the sole-surface thereof and also near the comb, whereby the last will be firmly held, and, further, the said clamps are arranged to have a preliminary yielding engagement with the last to secure an automatic accurate adjustment thereof and to thereafter be setand fixed in an unyielding manner to preserve the adjustment, whereby they will accurately center and clamp all lasts of the particular size and shape to which they have been adjusted. This result is obtained in theillustrated embodiment of the present invention as follows: The upper ends of the levers 7 are preferably inclined slightly and provided with bearings S and 9, one half of such bearings being formed in the levers 7 and the other half in clampingplates 10, secured in place by means of bolts 11. The centering-clamps consist of sliding bolts 12, fitted in the bearings 8 and 9 and provided at their inner ends with suitable heads or contact-pieces 13 and at their outer ends with stop-nuts 14:. Each of the sliding bolts 12 is surrounded by a coiled spring 15, which bears against the head 13 and against the front end of the bearing through which the bolt slides, whereby the clamps are held forward or toward the last in a yielding manner preparatory to being preliminarily adjusted. It will be noted that the upper clamps are arranged to engage the last at or near the sole-surface thereof at the heel end of the last and that the lower clamps engage the last near the plates 10 to release the bolts 12 and permit them to slide freely in their bearings. The levers are then rocked toward the last to bring the heads 13 in contact therewith, the springs 15 yielding and permitting the bolts to slide backwardly in their bearings, thus positioning the clamps in their levers and adjusting them for the size of last, when by setting up the bolts 11 the clamping-plates will be caused to clamp the bolts and hold them in a fixed position, thus maintaining the adjustment.

While any suitable means may be provided .7

for actuating the levers 5, in the drawings I have illustrated mechanism substantially the same as the mechanism for actuating the corresponding levers shown in my pending application above referred to. This mechanism may be described as follows: To the ends of the shafts lto which the levers 5 are secured are secured short crank-arms 16, which are connected, by means of the links 17, to aslide 18, mounted to reciprocate in verticalguideways in a bracket secured to or formed integral with the rear portion of the base-plate '1. The links 17 are pivotally connected to the crank-arms 16 and to the slide 18, so as to constitute a toggle, the links being straightened during the downward movement of the slide to thereby swing the levers 5 in a direction to cause the clamps to come in contact with the sides of the last. For actuating the slide 18 a lever 19 is provided, the inner end of which is forked and provided with rolls 20, which engage grooves or slots in the slide 18. A coiled spring 21 is arranged to act on the lever 19 to raise the slide 18, and the outer end of the lever 19 extends into a position to be actuated by any suitable means.

Having described the construction and mode of operation of myinvention, Iclaim as new and desire to protect by Letters Patent of the United States- 1. In a shoe-supporting jack, the combination with a suitable last-support, of last-centering clamps, means for yieldingly forcing the clamps in contact with the sides of the last whereby they are adjusted, and means for rigidly maintaining the adjustment thus secured, substantially as described.

2. In a shoe-supportingjack, the combination with a suitable last-support, of last-centering clamps comprising independently-adj ustable members, one arranged to engage the last near the bottom thereof and the other near the comb, substantially as described.

3. In a shoe-supporting jack, the combination with a suitable last-support, of last-centering clamps, comprising suitable carriers, sliding spring-sustained bolts provided with engaging heads and a clampipgplate forlock- 6o ing the bolts in the carriers, substantially as described.

Intestimony whereof I affix my signature in presence of two witnesses.

, ERASTUS E. VVINKLEY. Witnesses:

T. HART ANDERSON, A. E. WHITE. 

